Lock



F. W. SCHROEDER.

LOCK.

APPLICATION FILED APR. I9. |920.

Patented oct. 26,1920.

6 W 4, 7.a. m T W V/ -I W. .i w /W. #d /III f n UNITED STA'ILES PATENT OFFICE.

FREDERICK WILLIAM SCHROEDER, OF LONDON, ENGLAND. f

LOCK.

' Application ined April 19,

To all fui/tom t may concern:

Be it known that I, Fn'nnninck WILLIAM Sciinonnnn, a subject oit the King of Great Britain, residing in London, England, have invented certain new and useful Improvements in Locks, of which the following is a specification.

This invention relates to locks oi' the latch type such as are used in connection with pin tumbler locks, and are provided with means controlled by the movements` of they lock handle and adapted to hold the bolt 'et the latch lock fast in either its forward or protruding position or in the backward or withdrawn position, `the holding 4or locking of the bolt in its backward or'forward position being effected by a further movement of the handle of .the lock beyond that necessary for shooting the bolt back or torward, such further movement being ei'lected in opposition to spring resistance, so that it is rendered diiiicult of accomplishment by a child.

The invention consists in an improved construction of the mechanism whereby the bolt of a latch lock oi the above kind is operated and locked in theilorward and backward position. v

According t0 the invention the bolt is connected with a bent plate slidably mounted in the lock casing and adapted to be actuated or moved to and fro by an arm on the spindle oro the lock handle, the plate being provided with integrally formed spring. portions that arefdescribedbelow and tend to check the movements of the handle and the actuating arm thereon.

The improved lock may be provided with known means, as hereinafter described, for preventing the lock bolt being operated or forced into its back or inoperative position by an unauthorized or other person 'from outside the door by means of a suitable instrument or appliance inserted or pushed into the crevice between the iront end :tace of the lock and the usual striking or catch plate casing carried either by; the door frame or j amb lining, or in the case of'lolding doors by the fellow kor companion door, the appliance being insertedso that its forward end bears against` the customary bev- Y eled end of the bolt thereby and thus pushes it toward its back position.

The invention will be described with reference to the accompanying drawings, which show a latch lock kand parts for Specification of Letters Patent. Patented 0G13. 26 1920 1920.V Serial N0. 375,107.

operating'its bolt. In the drawings Figure l is an elevation of the inner side face or that tace of the latch lock casing which, when the lock is liXedto ya door, willbe in contact with the inside face of the door;l

Fig. 2 is a sectional plan onA the line I-II in Fig. l, the bolt catch or striking plate easing fixed to the doori'rame or compan ion folding door being also included; Fig. 3 is an elevation of the lock casing in Fig. l with the inner'side face plate removed to show they bolt operating and locking means Figs. l and 5 are elevations of a spring member and rocking arm adapted toy co-k operate therewith, which constitute parts of the operating; and locking means shown in Fig. 3, the arm being shown in different positionsy in the respectiveligures; andFig. 6 is a perspective view of the above-'mentioned spring member.

' In the drawings a denotes a 4spindle ory barrel which is rotatablyy mounted in the lock casing and adapted'to be turned by a personr fromtheinner side oit thedoor by means of the `knob or handle c which is in one withor fixed to the spindle. The lock casing may be formed in any suitable manner but is here shown to consistof apart d constituting the main' portion of the case and a removable part d constituting vthe,

side facethat isadjacent to the inner face of the door when the lock is mounted on the latter.v Thepart d can be engaged with or secured to the part d in any suitable manner, asfor instance by means of the interengaging lugs d2, da on the' respective parts and by screws e that screw into lugsk d4.'

` The bolt f having the usualbeveled front end face fis attached in a customary manner to a pair of backwardly extending pins l" whichpass .through` a yoke plate g, coil springs It encircling the pinsz being interposed between thebackend face4 f2 of the `*bolt and the plate g. The springs` t tend to press the plate g, against the lugs l5 on the part l` The spindle anhasfixed on itinside the interior of the lock case a disk y' having a single extending'armj thereon, the outer end of which may be bent inward or at an angle to the arm face, and be provided at the center of thesaid bent portionwith a small indentation. This yarm is arranged kto cooperate with a slifdably mounted spring plate which is of peculiar bent construction'y and attached to the rear ends of the pins z' as best seen in Fig. 6.` The said spring'plate has a front part comprising a forwardly projecting portion 7c (Fig. 3), two substantially vertical or straight parts 76, 702 to which the pins e' are connected, an upper or longiti'ldinal part 7c3 and a rear part 7a4. rl`he plate is so stamped as to have three spring portions 745, 7a, 767 formed thereon and in a manner to yield or spring when engaged by the end `7'2 of the arm j when the lock handle c is operatedeither to move the bolt backward or forward, orto hold the bolt backward ina locked position, or to hold it forward in a locked position. The spring portion 705 is provided with a projection 728 for a purpose mentioned be low.

In order to carry outthe first operation, the handle c and spindle a are moved around in a direction to cause the internal arm j to move away from the normal position iiidicated in Fig. 3, and to tra-vely over the spring 705 carried by the back portion 704; the continued movement of the arm forces the plate backward against the pressure eX- erted by the springs 7L, thus withdrawing the pins t' andthe bolt f from its forward or locking position, Figs. 1, 2 and, to the back or open position. Further continued movement of the handle is checked by coming in contact with projection 71:8 referred to above. Should the handle be released the bolt is returned to its normal positionby the reaction ofthe springs 7a. vln order to hold the bolt locked in the said backward position the handle is turned around still farther in the abovev mentioned direction, forcing the bent up endV of arm j over the projection 7c3 so that thenotch in the end .7'2 snaps on to they projectionas shown in Fig. 4L. The end of the'back portion 71x* maybe bentinisuch amanner that it will project into the path-.of the arm to prevent further turning of the arm in that direction, should the latter be turned so far. Such a bent part or strip is shown at 709, Fig. 4l.'

In` order to fasten4 the bolt; in its forward position the handle is turned `in the reverse direction until it comes in contact with,springportion.ajover which it can be forced and thus enable the end of arm j to slide over the spring portion 727 and into engagement with the projecting4 part .7c ofthe plate, as indicatedin Fig, 5, which thus prevents the movement ofthe bolt backward. In like manner the handle can be turned backward and forced over the spring portions 7c? andc6 into thenormal position, Fig. 3, Yin orderto unlock the bolt.

vThe bolt f. may ink'nown mannery be drawn backward against the action of the springs 7L' and independently of thehandle c, by a person on the outer face ofthe door,

so as to open the door by means of any suitable key-actuated device associated with the parts shown in the drawings. Such a de'vice comprises a barrel piece Z (Fig. l), rotatably mounted on the inner face plate (7 a-ndprovided with a longitudinally eX- tending slot Z.Y To the barrel is fixed a disk m having' two' arms m, m2 that are shaped and ariganged respectively to engage operatively with the front face' of the parts 72' or 7a2 of the above mentioned spring plate when the barrel Z is turned in one direction or the'V other.

For turningthe barrel Z a removable key, which is not illustrated, but may be of any suitable known form, would be employed; such key having a part soshapedLand arranged that when the key is inserted in slot Z" it engages or bears against the sides thereof so that upon the key being turned the barrel will be likewise turned.

Thel parts m', m2 engaging the front face of the spring plate to which the pins z are rigidly attached, limit the extent of the forward movement the bolt and associated parts.

Any suitable known means may be providedto prevent the bolt, whenin its front or locking position and in engagement with the striking plate or catch casing n fixed to the door frame or a companion door o, from being pushed toward its back or open position by a person outside the door by means of la suitable instrument pushed from outside through a hole bored or cut for the purpose, throughthe door frame 0, into the crevice between the front end face (Z5 of the casing/and the adjacent end of the casing n, and against the beveled frontpface' f of the bolt. The' means shown consist of an outwardly extending lip or iange piece 'n' integralwith or attachedto the casing n, which piece may be suitably secured to the side face of the rabbeto of the door frame, as for instance by means ofscrews p. The ange piece n is preferably Aprovidedwith a chamferedfacer? so that it presents a surface difficult to bore out. It will be'seen from Fig. Qthat this piece n effectually masks theV joint or openingl between the door lock andits catch, and'prevents the insertion of any instrument therethrough to move the boltb'ack.

Having thus describedthe natureV of the said inventionand the best means I know into a locking position andbackwardly into an unlocking position, a spindle rotatably mounted in the casing, an operatinghandle,

carried by the spindle, an arm fixed at one end to the spindle, and means actuated'by the turning movements of the arm for operating the bolt and locking it both in its locking and unlocking positions, said means comprising a bent plate, having a front part, a back part, and a part connecting the said front and back parts, the front and back parts each comprising a projecting portion and an integrally formed spring portion yieldable when engaged by the free end of the arm, said arm adapted, when the handle and spindle are turned a predetermined amount in one direction, to engage with the spring portion on the said front part, thereby moving the plate and bolt forwardly into a locking position, and on further movement of the handle and spindle in the said direction to engage in the projection o n the front part, thereby locking the bolt in the locking position, said arm being also adapted, when the handle and spindle are turned in the opposite direction, to engage with the spring portions on the said back part, thereby retracting the plate and .bolt into an unlocking position and on further movement of handle and spindle in said opposite direction to engage with the projection on the said back part, thereby locking the bolt in the unlocking position.

2. ln a latch lock of the kind referred to, the combination of an inclosing case, a latch bolt mounted therein to slide forwardly into a locking position and backwardly into an unlocking position, a spindle rotatably l mounted in the casing, an operating handle carried by the spindle, an arm fixed to the spindle adjacent one end, means actuated by the turning movements of the arm lfor operating the bolt and locking it both in its locking and unlocking positions, said means comprising a bent plate having a front part, aback part and a part connecting the said front and back parts, the front and back parts each comprising. a projecting portion and' an integrally formed spring portion,

engage with the projection on the front part, f

therebyflocking the bolt in the locking po-y sition, said arm being also adapted, when the handle and spindle are turned in the opposite direction, to engage with the spring portion on the said back part, thereby retracting the plate and bolt into. an unlocking position, and on further movement of handle and spindle in said opposite direction to engage with the projection on the said back part, thereby looking the bolt in the unlocking position, and a keyactu'ated device for.' moving said bent plate and latch bolt backwardly from the locking position independently of the handle and spindle, said device comprising a barrel piece rotatably mounted in the said case, and a disk fixed to said, barrel piece and having a pair of oppositely directed arms adapted to engage with the front part of the bentplate. y

In testimonywhereof I have signed my name to this specification.

SCHROEDER. f 

